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MHATT-CAT Useful Operational Data for Run 1 of FY03


Eric Dufresne, Dohn Arms, Don Walko
MHATT-CAT
Started Oct. 19, 2002
(www.mhatt.aps.anl.gov/Sectors/Sector7/Operations/FY03_run1/)



Table of Content:

Introduction.

The work shown below is an account of useful operational data taken during
run 1 of FY03 on 7ID. This page will contain useful stability information on the
7ID High Heat Load Monochromator and also on the various repairs and problems 
identified during the run.

Summary of startup activities.

The operation started on Wednesday October 9. The APS runs this next week in 
high emmittance mode, i.e. Ex=7.43 nm-rad, Ey=0.0644 nm-rad, coupling 0.863%.
A monochromatic beam and white beam survey of the P5 hutch had to be done after
accessing the minihutch during the shutdown, but otherwise, no work was done on 
the monochromator. The mono was still aligned and first beam was available in 
the morning. 

Following an accident last run where the beam was lost, users are discouraged in
the future to use the picomotors to move the monochromator chi and theta angles.
It is best to use the piezo stage to tweak the monochromator from now on. Some
commissioning activities was spent to calibrate the piezo transducer using the
X-ray BPM as an angular detector.

Tuesday, October 15, 2002. Switch over to monochromatic mode from white beam mode, new APS top-up operation mode in the "NEW" top-up low emmittance lattice.

After switching the beamline to monochromatic beam operation, we noticed that 
the new mode of operation has a record low horizontal emmittance of Ex=2.32
nm-rad, Ey=0.068 nm-rad, and a coupling of 2.9% as seen on the EPICS PVs 
provided by the APS. It is the smallest horizontal emmittance ever achieved at
the APS and is believed to be the current limit. The flux difference is
noticable. In 7ID-B in a 0.5 mm (V) by 0.5 mm (H) white beam slit setting, we
observe 8.9 E12 ph/s 9 keV photons.

Fig. 10-15.1 shows the horizontal profile of the 7ID beam at the L5-20
position, i.e. 26.75 m from the source. A 200 um horizontal white beam slit
opening was used to profile the horizontal beam profile. A Gaussian fit (red)
is shown with a calculated FWHM of 1 mm. Clearly the 7ID undulator profile fit
well a Gaussian.

For comparison, a similar profile was last performed on 6/27/02 with a smaller
white beam slit opening of 100 um. Fig. 10-15.2 shows the profile on a scan
with a smaller range. The fit FWHM is 1.227 mm, thus about 22.7 % wider than
the previous figure. During the June run, Ex was 3.55 nm-rad whereas it was 
2.32 nm-rad on 10/15.

On 7ID, we typically run experiments using an horizontal slit opening of 0.5 mm,
thus a reduction of the horizontal emmittance increases the flux through this
typical aperture. All our experimental program benefit from this new mode. 
It also increases the horizontal coherence and coherent flux which benefits 
sector 2,7,8,15,34.
Horizontal beam profile on 10/15/02.

Fig 10-15.1. Horizontal profile of the APS 7ID beam on 10/15/02 in the record setting
low emmittance mode. The FWHM is 0.956 mm, the lowest recorded on 7ID.

Horizontal beam profile on 6/27/02.

Fig 10-15.2. Horizontal profile of the APS 7ID beam on 6/27/02 in the "old" low emmittance
mode. The FWHM from the Gaussian fit is 1.227 mm.

Wednesday, October 16, 2002. Time series with a 0.5 mm (H)
by 0.282 mm (V) white beam, with the mono at 9.0 keV, 7ID at 9.06 keV.


On the morning on 10/16, a time series was started to monitor the beam stability
during one of our user experiment. Fig. 10-16.1 shows the APS ring current, the
X-ray BPM sum in 7ID-C and the ion chamber signal in 7ID-C. The 7ID-B ion
chamber was not connected. The white beam slit was a little smaller than usual,
being set to 0.286 mm (V) and 0.5 mm (H). The ring current dipped near t = 0.5
h, and the diode and ion chamber signals more of less are stable. The
oscillation around t = 1.5 h and t = 6 h are likely caused by the filling of LN2
in the cryocooler.(See the vertical beam position motion in Fig. 10-16.2)

Fig. 10-16.2 shows the beam position monitored by the 7ID-C X-ray BPM quadrant
diode/fluorescent system. The beam move horizontally by 15 microns, but the
motion is more evident in the vertical and is likely due to the cryocooler 
filling itself every 4 hours or so. A 10 microns vertical oscillation occurs
over this 4 hour period.
Intensity data started on 10/16/02.

Fig 10-16.1. Time series of the beam intensity in 7ID-C, starting at 01h36 on 10/16 and lasting about 8 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown, but the 7ID-B chamber is not connected, reading background levels.

XBPM data started on 10/16/02.

Fig 10-16.2. The beam position, 49.2 m from the source, or 19 m from the High Heat Load mono in 7ID-C during the same time series as Fig. 10-16.1. Cogging is seen in the horizontal beam position, showing as a ~1 h period oscillation. The vertical motion is likely due to the LN2 fill.

Friday, October 18, 2002. Time series with a 1.0 mm (H)
by 0.5 mm (V) white beam, with the mono at 9.0 keV, 7ID at 9.06 keV.

This time serie was started on 10/18 at 17h25 and lasts for 5.5 hours. The L5-20
opening was set to 1.0 x 0.5 mm.  Fig. 10-18.1 shows
the 7ID-C diode sum and the APS ring current. The ion chamber signals are not
connected explaining the flatness of the curves. The diode sum tracks the ring
current during the time serie.

Fig. 10-18.2 shows the beam position in 7ID-C recorded
by the X-ray BPM. The horizontal position is stable to within 25 microns in 5.3
hours. Cogging is clearly evident in this data. Cogging is the beam motion 
induced by filling the singlet used for monitoring the APS beam position. Since
top up occurs about every two minutes, it takes about 23x2 minutes ~ 46 minutes
to fill all the buckets so when the singlet used for beam position is filled, 
significant beam motion occurs in the horizontal. The vertical motion shown 
around t=3 hrs is likely caused by the LN2 fill of the cryocooler.
Intensity data started on 10/18/02.

Fig 10-18.1. Time series of the beam intensity in 7ID-C, starting at 17h25 on 10/18 and lasting 5.5 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown, but the latter two are not connected.

XBPM data started on 10/18/02.

Fig 10-18.2. The beam position, 49.2 m from the source, or 19 m from the High Heat Load mono in 7ID-C during the same time series as Fig. 10-18.1. The beam motion caused by filling the bucket used for the RF-BPM is clearly seen in the horizontal beam position, showing as a ~1 h period oscillation. The vertical motion is likely due to the LN2 fill.

Saturday, October 19, 2002. Time series with a 1.0 mm (H)
by 0.5 mm (V) white beam, with the mono at 9.0 keV, 7ID at 9.06 keV.

This time serie was started on 10/19 at 00h45 and lasts for 21 hours. The L5-20
opening was set to 1.0 x 0.5 mm.  Fig. 10-19.1 shows
the 7ID-C diode sum and the APS ring current. The ion chamber signals are not
connected explaining the flatness of the curves. The diode sum is rock solid
during the 21 hours long time serie.

Fig. 10-19.2 shows the beam position in 7ID-C recorded
by the X-ray BPM. The horizontal position is stable to within 30 microns in 21
hours, although cogging is clearly affecting the horizontal position. The 
vertical position is also stable to about 25 microns in 21 hours, with the 
4 hours time scale likely caused by the filling of the LN2 system.
Intensity data started on 10/19/02.

Fig 10-19.1. Time series of the beam intensity in 7ID-C, starting at 00h45 on 10/19 and lasting 21 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown, but the latter two are not connected.

XBPM data started on 10/19/02.

Fig 10-19.2. The beam position, 49.2 m from the source, or 19 m from the High Heat Load mono in 7ID-C during the same time series as Fig. 10-19.1. Cogging is clearly seen in the horizontal beam position, showing as a ~1 h period oscillation. The vertical motion every 4 hours is likely due to the LN2 fill.

Saturday, October 19, 2002. Time series started at 23h57 with a 1.0 mm (H)
by 0.5 mm (V) white beam, with the mono at 9.0 keV, 7ID at 9.06 keV.

Fig. 10-19.3 shows the diode sum, ring current, ion chamber signal in 7ID-B and
C during a time serie started on 10/19 near midnight, and lasting a day and a
half until the Monday maintenance period at 8 am. A top up failure occur 13
hours into the time serie as seen in the ring current dip and the signal in all
the detectors shown are correlated to this dip.  The 7ID-B ion chamber, and
7ID-C diode sum overlap well with the ring current.  The 7ID-C ion chamber drops
because of a vertical beam motion which can be seen in the 7ID-C X-ray BPM
signal (see Fig. 10-19.4).  A slit 1 mm high is in front of this ion chamber so 
the signal is more sensitive to beam motion.

Fig. 10-19.4 shows the 7ID-C Beam position Monitor signals. In the vertical,
apart from a drift of 30 um (1 um/hour) noted above, bumps are seen every 3.5
hours likely due to the LN2 cryocooler fill. At 13 hours, the top up failure 
causes a bump in both X and Y positions. A long time scale oscillation with a
period greater than 12 hours is seen in the X position and cogging is also
clearly present. 

Fig. 10-19.5 shows the APS X-ray BPM signal projected from the beam position of 
the P1 and P2 X-ray BPM. Each BPM has an X and Y position, P1 being 16.3 m from
the source, while P2, 20 m from it.(See Fig. 10-19.6) After deducing the angle 
from P1 and P2, the beam position at 49.2 m is deduced from the angle and P2
position. Cogging is obvious in both X and Y positions and the amplitude is
consistent with those observed in the X motion in the 7ID-C X-ray BPM. The
vertical beam position shows a long time scale oscillation with a 25 micron
variation. A bump in X and Y is clearly seen near t=13 hours.
Intensity data started on 10/19/02 at 23h57.

Fig 10-19.3. Time series of the beam intensity in 7ID-C, starting at 23h57 on 10/19 and lasting 32 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown. The ion chamber signals have now been fixed. The time serie lasts all day on Sunday through Monday 8 am where the shutdown starts.

XBPM data started on 10/19/02.

Fig 10-19.4. The beam position, 49.2 m from the source, or 19 m from the High Heat Load mono in 7ID-C during the same time series as Fig. 10-19.3. Cogging is clearly seen in the horizontal beam position, showing as a ~1 h period oscillation. The vertical motion every 3.5 hours is likely due to the LN2 fill.

XBPM data started on 10/19/02.

Fig 10-19.5. The beam position, 49.2 m from the source, or 19 m from the High Heat Load mono in 7ID-C deduced by the APS BPM monitor P1 and P2, extrapolated for motion at 49.2 m from the source during the same time series as Fig. 10-19.3. Cogging is clearly seen in the horizontal beam position, showing as a ~1 h period oscillation. Some vertical beam motion is present as a long time scale oscillation with a 25 micron peak to peak variation in the first 15 hours.

The New XBPM screens.

Fig 10-19.6. The 7ID X-ray BPM screen from Glen Decker.

Wednesday, October 23, 2002. Time series started at 17h19 with a 0.2 mm (H)
by 0.2 mm (V) white beam, with the mono at 8.979 keV, 7ID at 9.06 keV.

The APS started again after two days of maintenance. It remained in the record
setting low horizontal emmittance lattice with Ex=2.29 nm-rad, Ey=0.0968 nm-rad.
The coupling increased today to 4.23% from 2.9% on 10/15. The beam in 7ID-C
moved by 0.5mm down first thing in the morning. 
Fig. 10-23.1, Fig. 10-23.2, and Fig. 10-23.3 shows the usual parameters in a 4
hour long time serie. 
Intensity data started on 10/23/02 at 17h19.

Fig 10-23.1. Time series of the beam intensity in 7ID-C, starting at 17h19 on 10/23 and
lasting 4 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown
but the 7ID-C Ion Chamber signal may be contaminated more strongly by 3rd harmonics
due to not running He in the 7ID-C flight path today.

XBPM data started on 10/23/02.

Fig 10-23.2. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C during the same time series as Fig. 10-23.2. The vertical motion at t ~ 2 h is
likely due to the LN2 fill.

XBPM data started on 10/23/02.

Fig 10-23.3. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C deduced by the APS BPM monitor P1 and P2, extrapolated for motion at
49.2 m from the source during the same time series as Fig. 10-23.3.

Wednesday, October 23, 2002. Time series started at 23h36 with a 0.2 mm (H)
by 0.2 mm (V) white beam, with the mono at 8.979 keV, 7ID at 9.06 keV.

Fig. 10-23.4, Fig. 10-23.5, and Fig. 10-23.6 show the usual parameters in a 11
hour long time serie started at 23h36. The APS dumped about 8.5 hours into the
time serie. Note that the beam motion after the refill is seen both in the APS
X-ray BPM and the 7ID-C X-ray BPM.
Intensity data started on 10/23/02 at 23h36.

Fig 10-23.4. Time series of the beam intensity in 7ID-C, starting at 23h36 on 10/23 and
lasting 11 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown
but the 7ID-C Ion Chamber signal may be contaminated more strongly by 3rd harmonics
due to not running He in the 7ID-C flight path today.

XBPM data started on 10/23/02.

Fig 10-23.5. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C during the same time series as Fig. 10-23.5. The significant horizontal
and vertical motion at t ~ 9.5 h is likely due to the APS beam loss.

XBPM data started on 10/23/02.

Fig 10-23.6. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C deduced by the APS BPM monitor P1 and P2, extrapolated for motion at
49.2 m from the source during the same time series as Fig. 10-23.4. The vertical motion of
60 um after the fill is seen in Fig10-23.5 also.

Friday, October 25, 2002. Time series started at 01h20 with a 0.2 mm (H)
by 0.2 mm (V) white beam, with the mono at 8.979 keV, 7ID at 9.06 keV.

Fig. 10-25.1, Fig. 10-25.2, and Fig. 10-25.3 show the usual parameters in a 10
hour long time serie started at 01h20. The APS ran smoothly during the night.
Note the APS BPM drift slowly in the vertical by 15 um over 10 hours.
(see Fig. 10-25.3)
Intensity data started on 10/25/02 at 01h20.

Fig 10-25.1. Time series of the beam intensity in 7ID-C, starting at 01h20 on 10/25 and
lasting 10 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown
but the 7ID-C Ion Chamber is not connected.

XBPM data started on 10/25/02.

Fig 10-23.5. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C during the same time series as Fig. 10-25.1.

XBPM data started on 10/25/02.

Fig 10-25.3. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C deduced by the APS BPM monitor P1 and P2, extrapolated for motion at
49.2 m from the source during the same time series as Fig. 10-25.1.

Saturday, October 26, 2002. Time series started at 01h02 with a 0.2 mm (H)
by 0.2 mm (V) white beam, with the mono at 8.979 keV, 7ID at 9.06 keV.

On Friday, I set up a Rh mirror in 7ID-C, so from now on the 7ID-C ion chamber 
signal may likely be more sensitive to beam motion because the ion chamber
probes the beam intensity after a 100 um by 100 um slit opening.

Fig. 10-26.1, Fig. 10-26.2, and Fig. 10-26.3 show the usual parameters in a 11
hour long time serie started at 01h02. The APS ran smoothly during the night.
Note the APS BPM signal drift slowly in the vertical and horizontal 
over 11 hours.  (see Fig. 10-26.3)
Intensity data started on 10/26/02 at 01h02.

Fig 10-26.1. Time series of the beam intensity in 7ID-C, starting at 01h02 on 10/26 and
lasting 10 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown.
The ion chamber in 7ID-C is now masked by a 0.1mmx0.1mm slit.

XBPM data started on 10/26/02.

Fig 10-26.2. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C during the same time series as Fig. 10-26.1.

XBPM data started on 10/26/02.

Fig 10-26.3. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C deduced by the APS BPM monitor P1 and P2, extrapolated for motion at
49.2 m from the source during the same time series as Fig. 10-26.1.

Sunday, October 27, 2002. Time series started at 01h44 with a 0.2 mm (H)
by 0.2 mm (V) white beam, with the mono at 8.979 keV, 7ID at 9.06 keV.


Fig. 10-27.1, Fig. 10-27.2, and Fig. 10-27.3 show the usual parameters in a ~11
hour long time serie started at 01h44. The beam dumped at 10h23 on 10/27. 
Some of the beam motion seen in the BPMs (APS and 7ID-C) and intensity variation
in the flux may be due to stabilization effects after the refill.
Intensity data started on 10/27/02 at 01h44.

Fig 10-27.1. Time series of the beam intensity in 7ID-C, starting at 01h44 on 10/27 and
lasting ~11 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown.

XBPM data started on 10/27/02.

Fig 10-27.2. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C during the same time series as Fig. 10-27.1.

XBPM data started on 10/27/02.

Fig 10-27.3. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C deduced by the APS BPM monitor P1 and P2, extrapolated for motion at
49.2 m from the source during the same time series as Fig. 10-27.1.

Monday, October 28, 2002. Time series started at 03h57 with a 0.2 mm (H)
by 0.2 mm (V) white beam, with the mono at 8.979 keV, 7ID at 9.06 keV.


Fig. 10-28.1, Fig. 10-28.2, and Fig. 10-28.3 show the usual parameters in a ~9
hour long time serie started at 02h19. The APS ran smoothly during the night.
The beam had dumped at 23h53 on 10/27 so 2h26 min before the start of the time 
serie so some of the vertical motion seen in the BPMs (APS and 7ID-C) may be due
to stabilization effects after start-up. 
Intensity data started on 10/28/02 at 02h19.

Fig 10-28.1. Time series of the beam intensity in 7ID-C, starting at 02h19 on 10/28 and
lasting ~9 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown.

XBPM data started on 10/28/02.

Fig 10-28.2. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C during the same time series as Fig. 10-28.1.

XBPM data started on 10/28/02.

Fig 10-28.3. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C deduced by the APS BPM monitor P1 and P2, extrapolated for motion at
49.2 m from the source during the same time series as Fig. 10-28.1.

Tuesday, October 29, 2002. Time series started at 03h57 with a 0.2 mm (H)
by 0.2 mm (V) white beam, with the mono at 8.979 keV, 7ID at 9.06 keV.


Fig. 10-29.1, Fig. 10-29.2, and Fig. 10-29.3 show the usual parameters in a 4
hour long time serie started at 03h57. The APS ran smoothly during the night.
The serie was stopped by the APS Tuesday studies period.
Intensity data started on 10/29/02 at 03h57.

Fig 10-29.1. Time series of the beam intensity in 7ID-C, starting at 03h57 on 10/29 and
lasting 4 hours. The 7ID-C diode sum, the ring current, ion chamber in B and C are shown.

XBPM data started on 10/29/02.

Fig 10-29.2. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C during the same time series as Fig. 10-29.1.

XBPM data started on 10/29/02.

Fig 10-29.3. The beam position, 49.2 m from the source, or 19 m from the High Heat Load
mono in 7ID-C deduced by the APS BPM monitor P1 and P2, extrapolated for motion at
49.2 m from the source during the same time series as Fig. 10-29.1.

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